Security Updates for Microsoft Skype for Business and Microsoft Lync and Microsoft Live Meeting (September 2017)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The Microsoft Skype for Business or Microsoft Lync or Microsoft Live Meeting installation on the remote host is affected by multiple vulnerabilities.

Description :

The Microsoft Skype for Business or Microsoft Lync or
Microsoft Live Meeting installation on the remote host is
missing security updates. It is, therefore, affected by
multiple vulnerabilities :

- An information disclosure vulnerability exists when
Windows Uniscribe improperly discloses the contents of
its memory. An attacker who successfully exploited the
vulnerability could obtain information to further
compromise the users system. There are multiple ways an
attacker could exploit the vulnerability, such as by
convincing a user to open a specially crafted document
or by convincing a user to visit an untrusted webpage.
The update addresses the vulnerability by correcting how
Windows Uniscribe handles objects in memory.
(CVE-2017-8695)

- An information disclosure vulnerability exists in the
way that the Windows Graphics Device Interface (GDI)
handles objects in memory, allowing an attacker to
retrieve information from a targeted system. By itself,
the information disclosure does not allow arbitrary code
execution; however, it could allow arbitrary code to be
run if the attacker uses it in combination with another
vulnerability. To exploit this vulnerability, an
attacker would have to log on to an affected system and
run a specially crafted application. Note that where the
severity is indicated as Critical in the Affected
Products table, the Preview Pane is an attack vector for
this vulnerability. The security update addresses the
vulnerability by correcting how GDI handles memory
addresses. (CVE-2017-8676)

- A remote code execution vulnerability exists due to the
way Windows Uniscribe handles objects in memory. An
attacker who successfully exploited this vulnerability
could take control of the affected system. An attacker
could then install programs; view, change, or delete
data; or create new accounts with full user rights.
Users whose accounts are configured to have fewer user
rights on the system could be less impacted than users
who operate with administrative user rights. There are
multiple ways an attacker could exploit this
vulnerability: In a web-based attack scenario, an
attacker could host a specially crafted website designed
to exploit this vulnerability and then convince a user
to view the website. An attacker would have no way to
force users to view the attacker-controlled content.
Instead, an attacker would have to convince users to
take action, typically by getting them to click a link
in an email or instant message that takes users to the
attacker's website, or by opening an attachment sent
through email. In a file-sharing attack scenario, an
attacker could provide a specially crafted document file
designed to exploit this vulnerability and then convince
a user to open the document file.The security update
addresses the vulnerability by correcting how Windows
Uniscribe handles objects in memory. (CVE-2017-8696)

See also :

http://www.nessus.org/u?4e352a51
http://www.nessus.org/u?8b9ff1ff
http://www.nessus.org/u?56771a41
http://www.nessus.org/u?f1f4d2c3
http://www.nessus.org/u?64c04506
http://www.nessus.org/u?e876cd3b
http://www.nessus.org/u?8f49fe21
http://www.nessus.org/u?8e609f52

Solution :

Microsoft has released the following security updates to address this issue:
-KB4011107
-KB4025865
-KB4025866
-KB4025867
-KB4011040
-KB3213568
-KB4025868
-KB4025869

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Windows : Microsoft Bulletins

Nessus Plugin ID: 103123 ()

Bugtraq ID: 100755
100773
100780

CVE ID: CVE-2017-8676
CVE-2017-8695
CVE-2017-8696

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